Wake Up, Sleeping Beauty Vol. 2 (manga)

Despite being a scaredy-cat and crybaby, high schooler Tetsu finds himself working at the eerie estate on the hill, where Shizu—the only child of the Karasawa family—is secreted away. However, his friendship with Shizu quickly turns to fear when several spirits of the dead appear before him, borrowing her appearance. As he struggles to find the humanity in her supernatural condition, Tetsu must also face a question at once terrifying and heartbreaking: what if the true Shizu never returns?